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Avalanche Forecast

Archived

Feb 18th, 2015–Feb 19th, 2015

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

South Coast.

Only light accumulations are expected on Thursday. Ullr promises to really make it snow if you become a member of Avalanche Canada. Sign up today by going to: avalanche.ca/membership

Confidence

Fair - Intensity of incoming weather systems is uncertain

Weather Forecast

A weak pacific frontal system will bring light snowfall (up to 5cm) Wednesday night and into Thursday. A clearing trend is forecast for Friday and Saturday as a ridge of high pressure rebuilds in the eastern Pacific. Winds are expected to be strong from the southwest on Thursday, and then become moderate from the northwest on Friday and Saturday. Daytime freezing levels should hover around 1500m for the forecast period

Avalanche Summary

No new avalanches have been reported. Small wind slab avalanches may form in response to light snowfall and strong winds on Thursday.

Snowpack Summary

On high north-facing terrain. light amounts of cold, lower density snow overlie a widespread thick hard crust. Below about 2000m there is no snow on the crust and surface runnels show the effect of last week's rain showers. Sun-exposed slopes became moist, or wet with recent daytime warming and solar radiation and are also likely refrozen. Below the surface crust, the snow may still be moist; however, the mid and lower snowpack are generally strong and well-consolidated. Most of the terrain below treeline is below threshold for avalanche activity.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.